Every inflation story mentions CPI. Almost none of them explain what it is. If you have ever nodded along to the news while quietly not understanding the number behind it, this post is for you. No shame. We will explain it in the simplest way possible.
Explain it like I’m 5
Imagine a market woman who keeps one fixed shopping list every month: rice, garri, beans, bread, transport fare, data, light and a haircut. Every month she adds up what the whole list costs. If it cost ₦100 last year and costs ₦115 today, the “price scoreboard” has gone up. That scoreboard is CPI. It is not a percentage. It is just a running total of what the same everyday things cost right now, compared with a starting point.
What CPI Means in Plain English
CPI stands for Consumer Price Index. Every month, the National Bureau of Statistics (NBS) checks the prices of a standard basket of goods and services, including food, housing, transport, clothing, healthcare and communication, and combines them into one number. That number is not in naira. It is measured in points, compared with a starting year, so that we can see how prices move over time.
CPI vs. Inflation: The Simple Difference
This is what most news reports never explain:
- CPI is the price level itself. It tells you how expensive the basket is right now.
- Inflation is how fast that number is climbing, usually shown as the percentage change over 12 months.
In short, CPI is the scoreboard and inflation is the speed. You need CPI to work out inflation, but they answer different questions.
Nigeria’s Recent CPI Numbers
Nigeria’s CPI rose to 146.3 points in August 2026, from 145.2 points in July. That is a monthly rise of 0.71%, compared with a 1.57% rise in July. Earlier this year, in March 2026, CPI climbed to 135.4 from 130.0 in February, according to reports at the time. Headline inflation, the yearly rate behind these numbers, was 15.39% in August 2026.
Why CPI Can Rise While Inflation Slows
This is where most people get confused, but it is easy once you see it. CPI went up in every month mentioned above. It never came down. What changed was the size of the rise: 1.57% in July, then only 0.71% in August. Inflation “easing” describes that smaller step. It does not mean CPI reversed. CPI hardly ever falls, except in a serious economic crisis.
How CPI Affects Salary, Savings and Spending
CPI is the raw material behind almost every money calculation that involves inflation. It helps you check whether your raise kept up with prices, whether your savings are earning enough to beat inflation, and how much more your monthly budget needs compared with a year ago. When you hear about “real salary” or “real return”, CPI is the number quietly working in the background.
Why Your Own Experience May Differ From CPI
CPI is a national average built on a standard basket. Your own spending almost certainly does not match it exactly. You may spend more on transport and less on healthcare than the average household. If the things you spend most on are rising faster than the overall CPI, your own cost of living will feel worse than the headline suggests, even though the official figures are correct.
How to Read an NBS Inflation Report
- Start with the CPI value. It shows how high prices are now compared with the starting year.
- Then check the headline inflation rate. That is the yearly change and shows the overall trend.
- Check the month-on-month change. It shows what is happening now, better than the yearly figure.
- Look at the food and core breakdowns. They often differ from the headline and matter more for daily life.
Common CPI Mistakes to Avoid
- Thinking falling inflation means falling CPI. It almost never does. CPI keeps rising, just more slowly.
- Treating the headline rate as your personal experience. Your own spending mix is probably different from the national basket.
- Ignoring the month-on-month figure. The yearly rate can lag behind what is happening right now.
Key Takeaways
CPI is the price scoreboard. Inflation is how fast the scoreboard is climbing. Nigeria’s CPI has gone up every month this year, even in months when inflation eased, because “easing” means slower growth, not a reversal. Once you understand that one idea, most confusing inflation headlines make sense. For more on how this touches your money, read our guides on what August’s inflation number means for you and how to work out your real salary after inflation.
Bookmark NairaDecoded.com for simple explainers that turn economic numbers into everyday money intelligence.
Sources
- Nigeria’s headline inflation eases to 15.39% in August — Nairametrics
- Nigeria’s Inflation Rate Falls To 15.39% In August — Channels Television
- Primary data: National Bureau of Statistics (NBS) — CPI & Inflation Reports
This article explains published economic data and general economic ideas and is not financial advice. See our Disclaimer. Figures are accurate as of the sources’ publication dates and may have changed since.
FAQ
What is CPI in Nigeria?
CPI (Consumer Price Index) is a monthly number published by the National Bureau of Statistics. It tracks the price of a fixed basket of goods and services, so we can see how the cost of living changes over time.
How is CPI different from inflation?
CPI is the price level, the scoreboard itself. Inflation is how fast that scoreboard rises, usually shown as a yearly percentage. You need CPI to work out inflation.
Why did Nigeria’s CPI keep rising even as inflation eased in August 2026?
Because CPI measures the price level, and prices almost always keep climbing. Inflation easing means the climb slowed (0.71% in August against 1.57% in July). It does not mean prices fell.
